Can't get a misfire code to set
Thread Starter
Teching In
Joined: Jan 2013
Posts: 33
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From: Sumas, WA
Can't get a misfire code to set So, I'm kinda tinkering around and just seeing where things are at. (Keep in mind, the car runs fine, I'm just wanting to know about why both the HPTuners Scanner AND the SnapOn Modis is not logging any misfire counters). I've noticed that the PCM is NOT seeing a dead misfire. No matter which cylinder I disable, whether it's fuel or spark, no matter how many ignition cycles. Even with a stock tune or the mail order tune, the results are the same.
In the DTC list in HPTuners, P0300 is enabled to set. But going down the list is just skips past all the specific cylinder misfire DTC's....P0300 then P0315 then P0327 and so on. However it does show DTC's for ignition coil controls for each cylinder, as well as injector controls for each cylinder. I can set codes for both injector and coil controls, but CANT set a specific misfire code and not even a lousy general misfire code P0300.
Is this just how HPTuners re-writes all the tunes? Whether a stock tune or not? If yes, that's EFFING retarded!
In the DTC list in HPTuners, P0300 is enabled to set. But going down the list is just skips past all the specific cylinder misfire DTC's....P0300 then P0315 then P0327 and so on. However it does show DTC's for ignition coil controls for each cylinder, as well as injector controls for each cylinder. I can set codes for both injector and coil controls, but CANT set a specific misfire code and not even a lousy general misfire code P0300.
Is this just how HPTuners re-writes all the tunes? Whether a stock tune or not? If yes, that's EFFING retarded!
Last edited by nvscott5; Jan 29, 2014 at 03:59 AM.
Thread Starter
Teching In
Joined: Jan 2013
Posts: 33
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From: Sumas, WA
Also, it's a stock 5.3L from 2001 Tahoe (gas), with full-length headers and conical air filter. 4L60E. And this is with a MAF. The torque converter is from an S10 so the stall is slightly higher than a Silverado
HP Tuners doesn't change anything on it's own. If you didn't change it then that is how the DTCs are stock unless someone else changed it before you. You would get more help posting the .hpt file too.
Thread Starter
Teching In
Joined: Jan 2013
Posts: 33
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From: Sumas, WA
Stock 2001 Tahoe 5.3L tune.hpt
Nova (Ed Hutchings Tune) 2001 Tahoe 5.3L.hpt
Last edited by nvscott5; Jan 29, 2014 at 08:56 PM.
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Well apparently you don't know that. And right now no one even knows what the vehicle is. WTH does sync better with the long tube headers mean? You Go Advanced to post the tune.
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Verdad Gallardo Thread Starter
Teching In
Joined: Jan 2013
Posts: 33
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From: Sumas, WA
And I still can't figure out how to upload the file. I keep seeing the drop down list where it shows "Attachments" but the first (and only) space is blank. I did notice that Java was uninstalled for some reason, don't know why. And flash and shockwave are up to date as well. I am using internet explorer don't know if it's the newest version or not (it's also not showing in my programs list for some reason). Does it only work in Firefox or Chrome?
Thread Starter
Teching In
Joined: Jan 2013
Posts: 33
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From: Sumas, WA
I got the misfire code setting issue solved. It was kind've a discrete simple mistake. First off, if the PCM hasn't yet had a CASE Learn/Crank Relearn then the PCM won't enable Misfire Detection (knock detection will always be there for drivability reasons). It took me a while to realize that the last time I had performed a Crank Relearn was back around August last year. Even after switching tunes a dozen times and leaving the battery disconnected multiple times, it never occurred to me that I had to perform a Crank Relearn in order for Misfire Detection to be enabled. I eventually was able to set a P0300, but after multiple attempts still no cylinder specific DTC's.
